Differential jack and carrier



Jan. 22, 1952 B. D. MONTEITH DIFFERENTIAL JACK AND CARRIER Filed Oct. 16, 1947 3 Sheets-Sheet 1 FIG. 1.

ATTORN EYS.

lNvElvF Bennie-Eff D. MUn cEH-h 24:5 Z} Q Jan. 22, 1952 Filed 001;. 16, 1947 B. D. MONTEITH DIFFERENTIAL JACK AND CARRIER 3 Sheets-Sheet 2 INVENTOR.

Benn 211 D .Mcnft Eflh 24102., ZZJ L ATTORN EYS.

Jan. 22, 1952 B. D. MONTEITH 2,583,114

DIFFERENTIAL JACK AND CARRIER Filed Oct. 16, 1947 3 Sheets-Sheet 3 INVENTOR.

ATTORNEYS.

fi inafi 13. Mun-ft 1 th Patented Jan. 22, 1952 DIFFERENTIAL JACK AND CARRIER Bennett I). Monteith, Oklahoma City, Okla. Application October 16, 1947, Serial No. 780,182

8 Claims. (01. 214-4) 7 This invention relates to improvements in a differential jack and carrier particularly arranged for lifting and carrying heavy differential housings for various types of trucks with comparative ease by a single mechanic with a saving of time and energy.

The primary object of this invention therefore is to provide such a jack and carrier structure which will enable a single mechanic to remove and replace the heavy differential assembly from any truck having a banjo type axle housing without enlisting the aid of others which operation has normally required several additional helpers. Accordingly the carrier may be placedin position under the differential housing, the jack raised, and the differential housing removed from the truck by one person with complete safety to the differential housing.

Another object of the invention is to provide a highly satisfactory and efficient jack structure for operation in such a jack and carrier combination.

Another object of the invention is to provide jig plates for engagement with various styles for different makes of trucks, in order that the differential jack and carrier may be used onany make of truck by the use of the proper jig plate.

Further objects and advantages will be apparent from the detailed description of highly practical forms of differential jack and carrier in accordance with my invention in the following specification, reference being made to the accompanying drawing forming a part thereof.

In the drawings:

Fig. l is a plan view of a differential jack and one form of carrier in accordance with my invention.

Fig. 2 is a side elevation thereof showing the carrier in an elevated position supporting a dif-- ferential assembly.

Fig. 3 is a cross sectional view thereof taken on line 3-3 of Fig. 2.

Fig. 4 is a longitudinal sectional view thereof on line 4--4 of Fig/1 taken in the direction of the arrows.

Fig. 5 is a similar longitudinal sectional view thereof on line 4-4 of Fig. 1 taken in the opposite direction.

Fig. 6, is a perspective view of the jack with a' modified form of carrier supporting another type of differential assembly in accordance with my invention.

Fig. '7 is a plan view of the carrier shown in Fig. 6.

Fig. 8 is an end elevation of the same q l t i Fig. 9 is a side elevation thereof.

Fig. 10 is a plan view of a further modified form of carrier in accordance with my invention.

Fig. 11 is an end elevation thereof and v Fig. 12 is a longitudinal sectional view taken on line l2l2 of Fig. 11.

Referring to the drawings in general my invention comprises a mobile differential jack 2!) with a jig base plate 2l arranged to support a selected jig plate 22, 2'3, 24, or the like appropriate for engaging and supporting a differential assembly Da, Db or the like of an automotive vehicle, the jig plates 22, 23, 24 or the like being formed for the differential assembly it is to cooperate with, either through gravity cooperation or clamping engagement or the like with portions of the differential assembly.

As illustrated in Figs. 1 to 6 inclusive the mobile difierential jack 2!] comprises a substantially V-shaped base structure 25 preferably composed of hollow steel tubing or rod or shaft members of suitable weight and size tho various metals or alloys of aluminum, magnesium or steel of I- beam angle iron or tubing may be employed. The

members of this base may be formed in sections and welded or otherwise integrally connected with upper and lower metal plates 26 and 2'! secured to the front end of base tubing sections 25 and angle plates 28 having lower side mounting elements 29 secured to the rear ends thereof. Lower front plate 21 and sides 29 of angle members 28 provide base structures upon which swivel ball bearing casters 3B are mounted as a three point movable support. By virtue of these casters the jack can always be made level even on uneven floor.

Jig base plate 2! is illustrated as a substantially rectangular structure bowed downwardly longitudinally. Jig base 2| is supported by means of three connecting link or radius rod elements. A radius rod element 3| is disposed at one side of the forward end of plate 2!, and the othertwo radius rod elements 32 are disposed at the rear end thereof to support it adjacent the forward end of base 2 5, so that it can swing from a lowered compact position as shown in Figs. 4 and 5 to an operating upper position as best shown in Figs. 2; 3- and 6. Forward radius rod element 3! is mounted on a bearing 33 extending from a projection 34 on the upper plate 26 while the rear radius rod elements. 32 are mounted on lower bearings 35 extending laterally form mountings 36. on the inner sides of the side base tube ele-Q ments of base 25 The upper ends of radius rod elem nts 3|. and 3 2 are journaled on" bearings 3! and 38 respectively having bearing supports 39 and 46 on the under side of jig base 2|.

By so mounting radius rod elements 3| and 32 with respect to the V-shaped base 25, that is as a parallelogram with the rear mountings lower than the front mounting, the jig base sets obliquely to the floor, as does the lower outline of most truck differential housings. The load is downward at all times. The shape of the base makes it almost impossible to overturn and the load is-centered on the three casters with no tendency to rock. The upper carrier base 2| can be lowered into the base when not in use.

To lift the upper carrier baseplate 2| the mechanical advantage of a screw shaft 4| is used. A nut 42 is fastened to the bottom of the upper carrier base 2| by means of pivot 43 secured to the underside of the rear bearing support 46 at the rear underside of jig 2|. Screw shaft 4| is provided with spaced *stops 44 adjacent to its other end for anchoring thescrew shaft in an eye 45 between the stops, eye 45 being. in an elevated position above base 25 integrally secured to an arm 46 secured to and extending upwardly from plate 26 at the front end of base 25. Screw shaft e 4| has a swivel handle 41 at. its forward end for turning it for adjusting the upper base 2| to the desired height as a preferred and most convenient form of differential operating means in the jack altho other form jack operating elements could be used forraising or lowering the upper carrier base 2|. It will be seen that with the jack operating screw shaft 4| as shown the upper carrier base 2| may be raised to any desired height or lowered into the jack base 25 so that a compact structure is provided when not in use and it is low enough so that it may be readily positioned under any of the usual differential assemblies.

Upper jig plate carrier base 2| is arran ed to support jig plates for different types of commer- .cial rear end assemblies now in use, com rising the jigplates 22, 23 and 24 heretofore referred to. Each of these plates has a slot 48 in its forward end and is formed with a central cylinder hinge bearing element 49 at its rear end. Base 2| has a forward vertical adjusting screw 56 at its forward end with a handle 5| at its lower end under plate 2| and an-enlarged grooved upper end 52 into which the edges of the jig plate slot 48 are received. Lateral cylinder hinge bearing elements 53 extend from a late 54 sec red to the rear end of jig plate base2| and a intle or floating pin 55 provides a removable connection whereby any of the ji plates 22. 23 or 24 may be secured to th s carrier base 2|. I

In general these jig plates all com rise slightly curved main body portions which conform somewhat to the curvature of the jig base plate 2| and more particularly with the different types of rear end assemblies. They are constructed with engaging elements for the various commercial differential housing assemblies with various types of notches, clamps, adjustable sockets and the like for gripping the assembly when the jack is positioned and adjusted in place with respect thereto. These jig plates may be formed so as to be preferably particularly applicable to a certam specific model of rear end assembly so as to have general or universal application.

As an example of a jig plate 22 for specific application to a differential assembly De. outlined in the upper part of Fig. 2, a Timken type of rear end, the plate-is provided with upwardly curved side arms 57 which have upper notches 68 which fit the lower studs 59 of the cross shaft cover plates 60 on the differential housing. At the front end of this Timken jig plate 22 as shown another support 6| is secured by a bolt 62 to the plate and having a slot 63 for length adjustment so that a collar 64 on the end of this support 6| can be slipped over the stud nut of the pinion housing of the Timken differential assembly. As shown in Fig. 1, plate 22 is apertured at 65 to receive a similar support and socket for a modified model of such Timken differential assembly. This jig plate 22 is likewise applicable to other rear end assemblies including Chevrolet Standard, Chevrolet, G. M. C., Eaton, International, as well as Timken and others.

In Figs. 6 to 9 inclusive I have illustrated a universal type of jig plate 23 which is shown specifically applied to Fig. 6 to a Timken third member assembly. This plate 23 has lateral arms 66 each with a longitudinal slot 6'! thru which bolts .68 extend for holding upright clamp supports 69 in any desired position for universal application. Clamp supports 10 are mounted by means of pivot clamping bolts 1| in the upper ends of supports 69 so as to be angularly adjustable and together with the clamping bolts 68 for supports 69 universally adjustable with respect to plate arms 66 as well as adjustable inwardly and outwardly of these arms. Loose and rigid clamping plates 12 with clamping bolts 13 extend from clamp supports 10 and by means of the adjustments of the members they can be arranged to be clamped to rib flanges 14 of a differential assembly Db as illustrated in broken lines in the perspective view, Fig. 6. This universally adjustable jig plate 23 is for use with numerous styles of rear end assemblies, the one indicated in the drawings being a Timken third member assembly.

Jig plate 24 illustrated in Figs. 10, 11 and 12 is a simplified construction similar to jig plate 23 but having clamping elements 14 extending inwardly from the upper ends of upwardly curved side members 15 extending from rear end of jig plate 24. As will be seen this jig plate is adapted for gripping rib flanges and the like of various differential assemblies.

I claim:

1. A differential jack and carrier comprising a portable jack including a substantially V-shaped base with wheels supporting the same providing a three point support, a jig plate base carried by said V-shaped base, a forward and two rear parallel links of substantially equal length piv-' otally connected with the under side of the jig plate base adjacent to the front and rear ends thereof, a pivot support for the lower end of the front link above the front of the v base, pivot supports for the lower ends of the two rear links in lower positions between the sides of the base to the rear of the front support, means for raising andlowering the same with respect thereto, a jig plate, means for mounting the jig plate on said jig plate base including a horizontal pivotal connection with the jig plate base at the rear thereof, said jig plate having a longitudinal slot at the front end thereof, an upwardly extending adjusting screw in the forward part of the j plate base having its upper end formed to en- 'gage said slot in the jig plate, an operating handle on the lower end of said screw for operating the same'for raising and lowering the front end of the jig plate with respect to the jig base plate, and means on said jig plate for engaging and holding an automotive rear end difierential as emb 2. A differential jack and carrier comprising, a portable jack including a V-shaped base, wheels at the end of said base providing a three point portable support, a jig plate base over said V- shaped base, a forward and two rear link supports for said jig plate base, pivotal connections between said links and the jig plate base and said V-shaped base providing a substantially parallel link connection with the forward link having its pivotal connections elevated with respect to the link connection of the pair of rear links with the V-shaped base, a rotatable screw extending rearwardly of the front end of the jack base, means on the front end of the screw for rotating the same, an upward support for said V-shaped base supporting the forward end of the screw and preventing relative longitudinal movement thereof, a nut movable on and movable by said screw connected with said jig plate base between the upper ends of said rear pair of link supports, a jig plate mounted on said jig plate base, and means on said jig plate for engaging and holding an automotive rear end differential assembly.

3. A differential jack and carrier comprising, a portable jack including a V-shaped base, wheels at the end of said base providing a three point portable support, a jig plate base over said V- shaped base, a forward and two rear link supports for said jig plate base, pivotal connections between said links and the jig plate base and said V- shaped base, a support on the front end of the V-shaped base for supporting forward link pivotal connection in an elevated position with respect to the jack base, supports for the pair of rear link pivotal connections extending laterally inward from the sides of the V-shaped base, a rotatable screw extending rearwardly of the front end of the V-shaped base, means on the front end of the screw for rotating the same, an upward support for said jack base supporting the forward end of screw and preventing relative longitudinal movement thereof, a nut movable on and movable by said screw connected with said jig plate base between the upper ends of said rear pair of link supports, a jig plate mounted on said jig plate base and means on said jig plate for engaging I and holding an automotive rear end difierential assembly.

4. A differential jack and carrier comprising, a portable jack including a substantially V- shaped base with wheels supporting the same providing a three point support, a jig plate base carried by said V-shaped base with means for raising and lowering the same with respect thereto, a jig plate mounted on said jig plate base, said mounting comprising complementing hinge cylinder elements on the rear of the jig plate base and jig plate, a removable hinge pintle connecting the same, and an adjustable support for the front end of said jig plate, laterally adjustable upright arms on said jig plate and clamping means carried at the upper ends of said arms for engaging and holding an automotive rear end differential assembly.

5. A differential jack and carrier comprising, a portable jack including a substantially V- shaped' base with wheels supporting the same, providing a three point support, a jig plate V- shaped base carried by said base with means for raising and lowering the same with respect thereto, a jig plate mounted on said jig plate base, said mounting comprising complementing hinge cylinder elements on the rear of the jig plate base and jig plate, a removable hinge pintle connecting the same, a screw extending upwardly through the front end of said jig plate base, an operating handle on the lower end of said screw, a circumferentially grooved head on the upper end of said screw, said jig plate having a slot in its front end so as to be removably engageable with the groove in the head on the upper end of said screw, laterally adjustable upright arms on said jig plate and clamping means carried at the upper ends of said arms for engaging and holding an automotive rear end differential assembly.

6. A differential jack and carrier comprising, a portable jack, a jig plate base carried by said jack, a jig plate removably connected to and supported by said jig plate base, and means on said jig plate for engaging an automotive differential housing comprising, lateral upwardly extending arms at the rear of said jig plate, and clamps pivotally mounted on the upper ends of said arms for engaging rib flanges of the differential housing.

7. A differential jack and carrier in accordance with claim 1 in which said differential housing holding means comprises lateral upwardly extending arms at the rear of said jig plate, means at the upper ends of said arms for engaging portions of differential housing comprising notches in the upper ends thereof which engage lower studs of the cross shaft cover plates of the diiferential housing, and a support with a collar on the front end of the jig plate for engaging a forward stud nut on the differential housing.

8. A differential jack and carrier comprising, a portable jack, a jig plate base carried by said jack, a jig plate removably connected to and supported by said jig plate base, and means on said jig plate for engaging an automotive differential housing comprising, lateral arms at the rear of said jig plates, said arms having longitudinal slots therein extending outwardly of the jig plate, supports extending upwardly from said arms, pivot bolts connecting said supports to said arms through said slots, clamp supports and clamps at the upper ends of said supports, and pivot bolts connecting said clamp supports to said upstanding supports.

BENNETT D. MONTEITH.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,614,034 Holmes Jan. 11, 1927 1,720,825 Durand July 16, 1929 1,751,480 Howell Mar. 25, 1930 2,235,972 Zimmerman Mar. 25, 1941 2,367,784 Knoizen et a1 Jan. 23, 1945 2,409,468 Bock Oct. 15, 1946 2,418,443 Wiesner Apr. 1, 1947 FOREIGN PATENTS Number Country Date 370,828 Great Britain Apr. 14, 1932 

